The Grand Theatre logo is seen in Lafayette, Louisiana on July 24, 2015, following a deadly shooting the night before. (YURI GRIPAS/AFP/Getty Images)

LAFAYETTE, La. (CBS Houston/AP) — The Southern Poverty Law Center, which tracks hate groups, said it has had John Russell Houser’s name in its files since 2005, when he registered at former Ku Klux Klan leader David Duke’s European-American Unity and Rights Organization conference.

In online forums, Houser wrote of the “power of the lone wolf” and expressed interest in white power groups, anti-Semitic ideas and the anti-gay Westboro Baptist Church, which protests soldiers’ funerals, the center said.

“Hitler is loved for the results of his pragmatism,” Houser wrote in January on the website stateofmind13.com. “There is no question of his being the most successful that ever lived. At this time the US is no more than a financially failing filth farm. Soon the phrase ‘ruling with an iron hand’ will be palatable anew.”

In another post on the Golden Dawn website, he said: “It is a shame Tim McVeigh is not going to be with us to enjoy the hilarity of turning the tables with an IRON HAND.”

Authorities say Houser opened fire inside a movie theater on Thursday night, killing two people and wounding nine others before he killed himself.

Authorities say there were about 300 people at the movie theater at the time of the shooting and 25 tickets were sold for “Trainwreck,” the movie where the shooting took place.